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Old Jan 14, 2006 | 02:06 PM
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Engine Operating

I have an 86 F-150 with the 4.9 6 cylinder engine. I have been trying to locate what the optimum engine temperature is for operating on a daily basis. I live in southern Oregon and drive it everyday. If someone can let me know, that would be great.
 
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Old Jan 14, 2006 | 03:42 PM
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Go with a 195 degree stat.
 
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Old Jan 14, 2006 | 05:04 PM
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Old Jan 15, 2006 | 12:45 AM
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Thread moved to " Inline Six, 200, 250, 4.9/300" tech forum. There are more resources here for your question.
 
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Old Jan 15, 2006 | 12:46 AM
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use the oem 195 tstat. the engine will run about 205-215 or so
 
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Old Jan 15, 2006 | 09:54 AM
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when i put in my new rad last winter i went with the 180, because thats all our local store had in stock. I needed the truck rightaway to pull my parents truck out of a field. I get about 12mpg, if i change it out to a 195 would the mileage pickup a bit?
 
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Old Jan 15, 2006 | 10:57 AM
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Theoretically it should. Whether you would actually notice any gain is doubtful, but your engine operates most efficiently at the higher temp.
 
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